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1989 Mercedes Benz 300se Tachometer & Speedometer
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Posted at Thu Feb 26, 2009 2:10 pm |
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By
bryan321,
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Electrical problem
1989 Mercedes Benz 300se 6 cyl Two Wheel Drive Automatic 185000 miles
About a year ago my tachometer quit working after the engine was revved while driving and the transmission shifted abruptly.
A few months ago my speedometer quit working too. I have the web driven Mercedes Service manual from MB but I have been unable to find any information in the manual on how to trouble shoot or fix either problem. |
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Posted at Thu Feb 26, 2009 2:17 pm |
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By
rasmataz,
Certified 2CarPros Master Technician |
 (14780) Give Feedback | Votes: 348 |
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If it was me I'll start with the speedometer impulse transmitter on left rear of transmission. |
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Posted at Thu Feb 26, 2009 2:21 pm |
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By
bryan321,
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What about the Tach? I saw on a parts website that there are speed sensors on the front wheels. Are these for the ABS system? Not the speedometer. |
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Posted at Thu Feb 26, 2009 2:35 pm |
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By
rasmataz,
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(14780) Give Feedback | Votes: 348 |
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Does it have a vehicle speed sensor I've looked couldn't find one-check that if it has one.
The ABS rpm sensor is at the front and back of the vehicle and also it has its on computer |
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Posted at Thu Feb 26, 2009 2:50 pm |
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By
bryan321,
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Just got off the phone w MB dealership. He could not find the speedometer impulse transmitter as a stand alone part. He mentioned a transmission harness. He also mentioned that the tachometer runs off of an engine componant, cam, crank, alternator. Do you have any ideas what runs the tachometer? |
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Posted at Thu Feb 26, 2009 2:59 pm |
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By
rasmataz,
Certified 2CarPros Master Technician |
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(14780) Give Feedback | Votes: 348 |
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The CPS gives the computer the piston postions and engine speed, CMH synchronizes the injectors and what stroke its in |
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Posted at Thu Feb 26, 2009 3:06 pm |
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By
bryan321,
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What is CPS & CHM? |
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Posted at Thu Feb 26, 2009 3:16 pm |
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By
rasmataz,
Certified 2CarPros Master Technician |
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(14780) Give Feedback | Votes: 348 |
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CPS --Crankshaft Position Sensor
CMH--Camshaft Position Sensor |
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